Tillage disk



Sept. 27, 1932.

TI'LLAGE-DISK Filed June 8, 1931 2 Sheets-Sheet l .w. s. GRAHAM1,879,193

Sept. 27, 1932. w s, GRAHAM 1,879,193

TILLAGE DISK Filed June 1931 2 Sheets-Sheet 2 A w w i,

Patented Sept. 27, 1932 UNITED STATES PATENT OFFICE WILLIAM S. GRAHAM,OF CANTON, ILLINOIS, ASSIGN OR TO INTERNATIONAL HARVES- TER COMPANY, ACORPORATION OF NEW JERSEY TILLAGE DISK Application filed June 8, 1931.Serial No. 542,770.

This invention relates to tillage tools and more particularly to theconstruction of tillage disks of the skeleton or open type.

Disks of the type stated are adapted to be used on agricultural machinesfor tillage purposes generally and are commonly used in pairs ascovering disks on lister planters.

It as heretofore been the practice to construct such disks of assembledparts, as, for instance, the hub, spokes, and rim, which are riveted orotherwise secured together.

The main purpose of this invention is to do away with the cumbersome andexpensive structure heretofore used and provide a onepiece skeleton diskhaving the strength and rigidity of the older structures while being ofless weight and capable of production at less cost.

A preferred embodiment of the invention is illustrated in theaccompanying drawings,

wherein- Figure 1 is a face or front view of the onepiece skeleton diskof this invent-ion;

Figure 2 is a rear or back view of the same;

Figure 3 is an enlarged cross section on the line 33, Figure 2;

Figure at is a cross section of the hub portion of the disk on the line44, Figure 2;

Figure 5 is a cross section of a spoke on the line 55, Figure 2; and

Figure 6 is an enlarged detail sectional view through the disk rim wherethe spokes merge therewith.

The disk structure here disclosed is formed from a single piece of sheetmetal, preferably steel, by any preferred method, as by pressing a diskblank into form and then cutting out the mettle between the spokes toprovide a wheel-like or open concavo-convex disk of the form illustratedin Figures 1 and 2.

The disk as a whole is preferably of the usual concavo-convex type andits structure consists of a hub portion having a flatcenter 10 providedwith a central opening for reception of a shaft or spindle and withsuitable rivet or bolt holes, as shown, for securing the disk to theflange of a bearing sleeve. The flat central portion 10 of the hub ispreferably offset inwardly or towards the concave side of the disk, asbest seen in Figure 3, and is also of dished or arcuate form in crosssection and extend from the annular dished portion 11 of the hub. Thesespokes merge at their outer ends into a rim 13, the periphery of whichis beveled or sharpened, as at 14. In the preferred form illustrated thespokes are curved radially in the direction of the axis of the disk andthe rim is continued on the arc of curvature of the spokes, therebydisposing the radial diameter or surface of the soil engaging rim of thedisk at an obtuse angle to the axis. At the junction of the spokes withthe rim the spokes are widened or flared, opposite webs of metal 15being left to strengthen the structure at this point. 7

A disk of the construction described will be light, but rigid, as thearcuate formations in the hub and spokes reenforce the disk wheredesirable for resistance to the bending stresses to which the disk issubjected while in use. Moreover, the absence of rivet or bolt Acoricavo-convex skeleton tillage disk.

consisting of an integral metal structure formed with a central portionprovided with a shaft receiving opening, a flat annular portionimmediately surrounding said opening,

an annular portion of arcuate cross section surrounding said flattenedportion, spokes of arcuate cross section radiating from said arcuateannular portion, and a peripheral rim into which said spokes merge, thespokes being flared at their junction with the rim.

In testimony whereof I aflix my signature.

WILLIAM s. GRAHAM.

